SU756159A1 - Oxidation-free high-speed heating furnace - Google Patents

Description

The invention relates to metallurgical furnaces and can be used for oxidation-free heating of the metal in forging and stamping production and heat treatment.

A non-oxidizing heating furnace is known, which includes preliminary and final metal heating zones, separated from each other by a refractory screen, which has a window for moving products of incomplete combustion, a mechanism for moving workpieces and a burner [1]. ^ten

However, in such a furnace is not fully used the heat of combustion products.

Also known is a furnace without oxidation heating, which contains a working chamber, an afterburning chamber, separated from the working perforated wall, a burner and a nozzle for supplying air into the afterburning chamber, and a recuperator [2].

The disadvantages of a known non-oxidative heating furnace are the low structural strength of the intermediate roof, which collapses when the hammers are in operation, and also that the combustion products, after their burning, leave the furnace with a high temperature.

Perratura, which causes increased fuel consumption.

The purpose of the invention is to intensify the heating process by increasing the heat exchange surface.

The goal is achieved by the fact that the afterburning chamber is made around the perimeter of the worker.

FIG. 1 shows the proposed furnace, longitudinal section; in fig. 2 - working chamber, cross section; in fig. 3 - the same horizontal cut.

A non-oxidative heating furnace includes a working heating chamber A, bounded by a vault 1 with a flat flame vault burner 2 installed on it, and on the sides by three perforated walls 3 and a loading window with a closing lid. The shape of the holes in the windows - narrow slits. Between the perforated walls and the lined walls of the furnace 4 there is a chamber B afterburning products of incomplete combustion. For supplying secondary air to chamber B, an air collector 5 is made in the hearth of the furnace to after-burn the products of incomplete combustion in it, which is connected to the heat exchanger 6. For injection and distribution of the secondary air

spirit on the collector installed air

nozzle nozzles 7. To regulate thrust in a furnace in a pipe at its upper cut after

The heat exchanger is fitted with a damper 8.

For fuel flow control and air furnace equipped with a regulator 9 _co-5 ratio gas - air, which is mounted on parallel sections of gas and air, and for controlling the amount of secondary air blown into the crest between the burner and the air heater assembly 10 is installed air separation. In the boot window there is a fence in the masonry 11, connected by a channel with the afterburning chamber, to divert the air drawn into the furnace with the damper on the working window 12 ajar.

The non-oxidizing high-speed heating furnace works in the following way.

The air and gas required for the operation of the burner are fed to the gas-to-air ratio controller, which proportionally increases or decreases the flow of gas and air. After the ratio controller, the air enters the recuperator, where it is heated to 350–400 ° C. The heated air at the air separation unit is divided into primary air, which is supplied to the roof-burning burner, and secondary air supplied to the collector, from which it is directed through the air nozzles to the afterburning chamber B. The products of incomplete combustion from working chamber A of the furnace are taken through perforated walls and enter the afterburning chamber B, where they are completely burned, oxidized by secondary air, giving off heat to the perforated walls. The flue gases through the flue gas duct 13 enter the heat exchanger and heat the air. At the outlet of the heat exchanger in the pipe, a regulating valve is installed ^on the control valve, with the help of which the necessary thrust is provided to create the necessary vacuum in the afterburning chamber B. Through the intake windows, air is sucked into the post-combustion chamber B and enters the furnace during the open loading window. This provides a protective

the atmosphere in the working space of the furnace with the open loading window.

Thus, the application of the invention in the industry makes it possible to carry out non-oxidative heating of the metal before it is pressure treated. An increase in the number of radiating surfaces associated with the afterburning chamber reduced the heating time by up to 40%, which in turn reduced the specific fuel consumption by 30–35% and increased the specific productivity of the furnace with respect to metal.

This design of a non-oxidative high-speed heating furnace makes it possible to increase the productivity of the furnace and reduce the specific fuel consumption. Increased productivity is achieved by reducing the heating time in the furnace, which also reduces the specific fuel consumption per unit time. The reduction in heating time is due to an increase in the number of heat-radiating surfaces facing the working chamber. Radiant surfaces have high building strength, and the design of the furnace is easy to manufacture and easy to maintain.

Claims (1)

Claim A non-oxidizing high-speed heating furnace containing a fixed working chamber, an afterburning chamber separated from the working perforated wall, a burner and nozzles for supplying air to the afterburning chamber and a recuperator, characterized in that perimeter working.